The best car wash soap in the world is that which your 12 year old used on you 2008 Connie for Fathers Day. The brand is immaterial.
And that's the exact reason I don't wash my vehicles (they're all silver)...I may accidentally pick up a brillo pad instead of the sponge or cloth.
You shouldn't keep'em in the likker cabinet.
One bourbon, one shot, one brillo pad?
FTR, shot = Scotch.